HUNTC-350 "Big Brother Punishment Game" begins! This is a punishment game where a sister and her friend burst into the room of a brother who is usually considered creepy and suddenly show him his underwear! It escalates even more.

The older brother is usually seen as disgusting. His younger sister and friends burst in and suddenly show him their underwear, calling it a punishment for losing a game! Things escalate even further, forcing him to "show her pussy" and "be obedient"... and finally to sex! At first, the younger sister and her friends were genuinely against it. But even though they were calling it a punishment, they get excited and can't hide their true feelings of being curious about sex. And then the situation reverses, with her making him cum with her older brother's dick, which she was supposed to hate! The older brother, who was a tool in the punishment game, eventually reigns as the best older brother who makes her feel good!